diff --git a/.changeset/chilly-meals-sniff.md b/.changeset/chilly-meals-sniff.md
new file mode 100644
index 0000000000..6776f93154
--- /dev/null
+++ b/.changeset/chilly-meals-sniff.md
@@ -0,0 +1,5 @@
+---
+'@backstage/frontend-test-utils': patch
+---
+
+Disable the built-in `SignInPage` in `createExtensionTester` in order to not mess with existing tests
diff --git a/packages/app-next/src/index-public-experimental.tsx b/packages/app-next/src/index-public-experimental.tsx
index f258a660e3..16535dae98 100644
--- a/packages/app-next/src/index-public-experimental.tsx
+++ b/packages/app-next/src/index-public-experimental.tsx
@@ -15,11 +15,8 @@
  */
 
 import ReactDOM from 'react-dom/client';
-import { signInPageModule } from './overrides/SignInPage';
 import { createPublicSignInApp } from '@backstage/frontend-defaults';
 
-const app = createPublicSignInApp({
-  features: [signInPageModule],
-});
+const app = createPublicSignInApp();
 
 ReactDOM.createRoot(document.getElementById('root')!).render(app.createRoot());